The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 2009
Filed:
Aug. 02, 2006
Cary R. Murphy, Hickory, NC (US);
Daniel M. Goertzen, Conover, NC (US);
Mark K. Bridges, Hickory, NC (US);
David E. Vokey, Sidney, CA;
Cary R. Murphy, Hickory, NC (US);
Daniel M. Goertzen, Conover, NC (US);
Mark K. Bridges, Hickory, NC (US);
David E. Vokey, Sidney, CA;
Network Integrity Systems, Hickory, NC (US);
Abstract
A signal which varies over time is monitored to determine an alarm condition, where the sample stream of digital values from an A/D converter is divided in to equal length pieces and a Fourier Transform (FT) algorithm is used to transform each piece of the stream into a three dimensional dataset including frequency domain amplitude, frequency and time. A Frequency Envelope is calculated by taking the maxima over the time dimension for a period of time, leaving a two dimensional frequency domain amplitude vs frequency dataset which is compared with new data arriving to determine the alarm condition for each element of the Frequency Envelope either by applying a constant delta additively or multiplicatively or by using a 'leaky bucket' algorithm.